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Title:
油圧式無段変速装置
Document Type and Number:
Japanese Patent JP4605605
Kind Code:
B2
Abstract:

To prevent creeping start when starting an engine, and to surely stop a vehicle in a slope, in regard to a hydrostatic continuously variable transmission provided with a hydraulic servo mechanism of structure for controlling tilting of a movable swash plate connected to a piston by supplying the charge pressure through a swash plate angle control valve in order to slide the piston.

At least one of pressure receiver chambers 20a and 20b is provided with a positioning means 89 for positioning the piston 21 at a neutral position, where supply of pressure oil to the pressure receiver chambers 20a and 20b is stopped, in relation to a spool 22 positioned corresponding to the neutral position of a movable swash plate of a hydraulic pump during the time when an engine for driving the hydraulic pump for supplying pressure oil to the pressure receiver chambers 20a and 20 is stopped.

COPYRIGHT: (C)2007,JPO&INPIT


Inventors:
Koji Sakata
Mochizuki Yasuhisa
Application Number:
JP2005280570A
Publication Date:
January 05, 2011
Filing Date:
September 27, 2005
Export Citation:
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Assignee:
Yanmar Co., Ltd.
International Classes:
F16H61/423; F04B1/22; F04B1/26; F16H39/14; F16H61/40; F16H61/4069; F16H61/42; F16H61/433; F16H61/439; F16H59/74; F16H61/66
Domestic Patent References:
JP11247990A
JP5916549Y2
Attorney, Agent or Firm:
Juichiro Yano